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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 853 · 40 questions
TalentJR

Remember (Read in, drive out): Inputs: buttons, knobs, sensors. Outputs: LEDs, buzzers, motors, displays. Digital: HIGH (≈ 5 V) or LOW (0 V) only. Analog: any value in a range. Trace the program: only the LED’s own pin matters, and its last command decides ON or OFF.

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  1. 1.📶 How many states can a digital pin have? (a) one (b) a thousand (c) ten (d) two
  2. 2.Which of these is an output? (a) a water pump (b) a turning knob (c) a push button (d) a sound sensor
  3. 3.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  5. 5.Which of these is an input? (a) a motor (b) a temperature sensor (c) a servo motor (d) a speaker
  6. 6.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.Which of these is an output? (a) a motion sensor (b) a buzzer (c) a push button (d) a sound sensor
  8. 8.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  9. 9.Which of these is an output? (a) a motion sensor (b) a turning knob (c) a push button (d) a speaker
  10. 10.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  11. 11.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  12. 12.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.🔍 Which is the odd one out? (a) a speaker (b) a turning knob (c) a light sensor (d) a keypad
  16. 16.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.🔍 Which is the odd one out? (a) an LED (b) a servo motor (c) a turning knob (d) a buzzer
  18. 18.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  19. 19.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  21. 21.Which of these is an output? (a) an LED (b) a push button (c) a motion sensor (d) a turning knob
  22. 22.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) a servo motor (d) a keypad
  23. 23.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  24. 24.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  28. 28.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.Which of these is an input? (a) a buzzer (b) a keypad (c) a small display (d) an LED
  31. 31.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
  33. 33.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.Which of these is an input? (a) a servo motor (b) an LED (c) a light sensor (d) a speaker
  35. 35.🔍 Which is the odd one out? (a) a buzzer (b) a keypad (c) a motor (d) a servo motor
  36. 36.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) a keypad (d) a buzzer
  37. 37.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False

Answer key

  1. two
  2. a water pump
  3. OFF
  4. output
  5. a temperature sensor
  6. OFF
  7. a buzzer
  8. output
  9. a speaker
  10. digital
  11. input
  12. OFF
  13. OFF
  14. OFF
  15. a speaker
  16. OFF
  17. a turning knob
  18. False
  19. OFF
  20. True
  21. an LED
  22. a servo motor
  23. analog
  24. OFF
  25. OFF
  26. OFF
  27. input
  28. OFF
  29. OFF
  30. a keypad
  31. OFF
  32. 0 V
  33. ON
  34. a light sensor
  35. a keypad
  36. a buzzer
  37. ON
  38. OFF
  39. ON
  40. True

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